Activity: Talk or presentation › Oral presentation
We have studied the structural and electronic properties of atomic Pt chains on a germanium (001) substrate. Using scanning tunneling microscopy we show that these Pt chains undergo a phase transition from a 2x periodicity at room temperature to a 4x periodicity at low temperatures. The coupling between the atomic chains turns out to be of essential importance, since isolated Pt chains and chains located at the edge of an array of chains maintain their 2x periodicity at temperatures as low as 4.7 K. The 2x to 4x transition is accompanied by an opening of an energy gap and can be interpreted as a Peierls instability.
25 Feb 2008
DPG Frühjahrstagung 2008 Berlin: (DPG Spring Meeting)